WARRANTY

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How Does Wireless Charging Work?

At mophie we are no strangers to wireless charging. Newer to the smartphone scene, wireless charging technology allows you to easily charge your phone or device without using any cables. Whether you are on the go or simply tired of fussing with cables, wireless charging is a great alternative. A newer technology, wireless charging can seem a little complex at first so we’re breaking it down for you from A to Z.

What is wireless charging?

Wireless charging, or wireless inductive charging, is the process through which the batteries in an electronic device are recharged through an electromagnetic induction current. Although wireless charging appears to be a new technology because of its broadening application in modern personal electronic devices, most notably smartphones, the principles of wireless charging were demonstrated over a century ago by Nikola Tesla. Prior to the turn of the twentieth century, Tesla was able to use wireless inductive charging to power light bulbs that were placed a short distance away from an array of coils connected to a power source that generated an electromagnetic field. Although Tesla was unable to successfully translate this technology into a commercial product at the time, the legacy of his work can be seen today in wireless charging products.

Wireless charging is a technology that many of us have already used, perhaps without realizing it. For the past two decades, wireless charging has been used to power electric toothbrushes, razors, and household wireless phones. These products utilized a charging dock that the toothbrush or phone was set on to charge after use. This dock then charged the item through wireless inductive charging. For items such as toothbrushes and electric razors, this type of charging is safer due to the ability to function safely in a wet environment. Traditional charging through a cable in an application that may come into contact with water is inherently unsafe. If the charging cable is wet when plugged into the device it could either shock the user, or damage the product.

Wireless household phones, on the other hand, used the technology as a means to keep the phone fully charged while offering the convenience to pick up and use the phone without having to disconnect a charging cable. Both of these time tested applications have proven that wireless inductive charging can be beneficial and convenient to the end user in a variety of circumstances. Additionally, the relatively long history of wireless charging demonstrates that this technology can be safely utilized in an increasingly broad range of both personal and commercial electronics.

How does wireless charging work?

The typical phone charger takes the 220-volt Alternating Current (AC) coming in from your house and converts it to Direct Current (DC), which is needed to charge your device. First your phone charger steps down the 220v input current into a more appropriate current through the use of a transformer, which are a series of copper coils. This stepped down AC current is then converted into DC signal using a process called rectification. The rectified, but still oscillating, DC signal is then filtered and regulated to produce a stream of DC signal that has a minimal level of fluctuations. This regulated current is then passed to your device at a strength usually around 5v or 2v, depending on your charging station.

Wireless charging uses the same principles as direct charging. The high frequency 220v AC current coming from your house needs to be stepped down and converted to DC to power your device. However, it requires this process be accomplished over a spatial distance without the use of a cord between the power supply and device. To do this, wireless chargers utilize two separate coils to produce an electromagnetic field. One of these coils accepts the 220v AC current from your house and resides in the charging bay or dock of your charger. The AC current enters the device and is transmitted to the coil in the charging station through a transmitter circuit.

However, without a second coil present, no electromagnetic field is being created at this point. In wireless charging devices, the second coil is either embedded in the end user’s device (such as in their smartphone), or is embedded in an eternal battery pack case that encloses their device. Once the user places their smartphone onto or within range of the charging station, the current from the first coil within the charging station is transmitted to the second coil in the receiving device. The current passing through these two coils generates an electromagnetic field. The byproduct of this electromagnetic field is the generation of an electrical current in the receiving device. This generated current is then converted by a circuit located in the receiving device into a usable DC signal. Once this has been accomplished, the battery in your electronic device begins to charge.

Wireless chargers function by creating an electromagnetic field through two coils in close proximity. One coil is in the charging dock or pad; the other coil is typically in or attached to your phone or device. Once the electromagnetic field is created it then generates AC signal in the receiving device, which is then converted to DC signal and begins charging your battery.

Benefits of Wireless Charging

The main benefit of wireless charging is that it offers unparalleled convenience when compared to direct charging. Let’s take smartphones as an example. With wireless charging you can set your phone on the charging station and it begins charging. If you receive a phone call or text message, you can pick up your phone and use it or walk around with it, then return it to the charging station without having to plug in or unplug a cable each time. Or if you are like many and use your phone as an alarm clock but charge it overnight, once your alarm goes off you can easily and conveniently grab your phone and disable your alarm without having to fumble with the charging cable in the dark.

The second major benefit of wireless charging stations is they eliminate every cable except the one that runs from the charging station to your wall socket. Let’s face it, charging cables are a messy annoyance that many of us would gladly get rid of. Charging cables also potentially create fire hazards. This is particularly true near the end of a cable, where it is repeatedly bent when inserting it into a device. These bends can fray the insulation surrounding the cables, which can lead to arcing of current between cables and result in frayed or burned insulation. These weaknesses in cables can also lead to shock risks, which many of us can attest to first hand.

A third major benefit, related to both convenience and eliminating cables, is wireless charging stations offer the ability to charge multiple devices. While traditional charging docks can also do this, what you are left with is a mess of cables leading to each device being charged. Typically, users leave multiple cables in the charging dock for convenience, which results in a confusion of cables around the dock. With wireless charging stations, multiple devices or phones can be placed onto the dock and charge simultaneously with none of the mess of a standard charging station. Users can also quickly retrieve their device if they need to make a call or respond to a text message without disturbing the charging of another device.

One of the final major benefits of wireless charging is that you, as the consumer, can expect to see more wireless charging hubs popping up in major businesses, airports, and libraries in the near future. Businesses, such as Starbucks, have begun rolling out wireless charging stations to select stores, with the intention of expanding them within the near future. Because of the convenience that wireless charging offers, the availability of wireless charging stations is anticipated to replace that of standard charging docks within the near future. For people that travel often, wireless charging ensures that you will never have to worry about forgetting to pack your charging cable in order to keep your phone charged and ready to go.

Technology forecasters anticipate that wireless charging will continue to become more ubiquitous in our rapidly evolving electronics landscape. As devices continue to be upgraded and improved, increasing numbers of manufacturers will be incorporating wireless charging into the device itself.

Privacy Policy

What information do we collect?

We collect information from you when you register on the site, place an order, enter a contest or sweepstakes, respond to a survey or communication such as e-mail, or participate in another site feature.

When ordering or registering, we may ask you for your name, e-mail address, mailing address, phone number, credit card information or other information. You may, however, visit our site anonymously.

We also collect information about gift recipients so that we can fulfill the gift purchase. The information we collect about gift recipients is not used for marketing purposes.

Like many websites, we use "cookies" to enhance your experience and gather information about visitors and visits to our websites. Please refer to the "Do we use 'cookies'?" section below for information about cookies and how we use them.

How do we use your information?

We may use the information we collect from you when you register, purchase products, enter a contest or promotion, respond to a survey or marketing communication, surf the website, or use certain other site features in the following ways:

To personalize your site experience and to allow us to deliver the type of content and product offerings in which you are most interested.

To allow us to better service you in responding to your customer service requests.

To quickly process your transactions.

To administer a contest, promotion, survey or other site feature.

If you have opted-in to receive our e-mail newsletter, we may send you periodic e-mails. If you would no longer like to receive promotional e-mail from us, please refer to the "How can you opt-out, remove or modify information you have provided to us?" section below. If you have not opted-in to receive e-mail newsletters, you will not receive these e-mails. Visitors who register or participate in other site features such as marketing programs and 'members-only' content will be given a choice whether they would like to be on our e-mail list and receive e-mail communications from us.

Your Privacy Rights/ California’s Shine the Light Law

Pursuant to Section 1798.83 of the California Civil Code, residents of California have the right to request from a business, with whom the California resident has an established business relationship, certain information with respect to the types of personal information the business shares with third parties for direct marketing purposes by such third party and the identities of the third parties with whom the business has shared such information during the immediately preceding calendar year.

To request a copy of the information disclosure provided by Summit pursuant to Section 1798.83 of the California Civil Code, please contact 1.888.8mophie.

How do we protect visitor information?

We implement a variety of security measures to maintain the safety of your personal information. Your personal information is contained behind secured networks and is only accessible by a limited number of persons who have special access rights to such systems, and are required to keep the information confidential. When you place orders or access your personal information, we offer the use of a secure server. All sensitive/credit information you supply is transmitted via Secure Socket Layer (SSL) technology and then encrypted into our databases to be only accessed as stated above.

Do we use "cookies"?

Yes. Cookies are small files that a site or its service provider transfers to your computer's hard drive through your Web browser (if you allow) that enables the site's or service provider's systems to recognize your browser and capture and remember certain information. For instance, we use cookies to help us remember and process the items in your shopping cart. They are also used to help us understand your preferences based on previous or current site activity, which enables us to provide you with improved services. We also use cookies to help us compile aggregate data about site traffic and site interaction so that we can offer better site experiences and tools in the future.

We may contract with third-party service providers to assist us in better understanding our site visitors. These service providers are not permitted to use the information collected on our behalf except to help us conduct and improve our business. You can choose to have your computer warn you each time a cookie is being sent, or you can choose to turn off all cookies. You do this through your browser (like Netscape Navigator or Internet Explorer) settings. Each browser is a little different, so look at your browser Help menu to learn the correct way to modify your cookies. If you turn cookies off, you won't have access to many features that make your site experience more efficient and some of our services will not function properly. However, you can still place orders over the telephone by contacting customer service.

Do we disclose the information we collect to outside parties?

We do not sell, trade, or otherwise transfer to outside parties your personally identifiable information unless we provide you with advance notice, except as described below. The term "outside parties" does not include mophie inc.. It also does not include website hosting partners and other parties who assist us in operating our website, conducting our business, or servicing you, so long as those parties agree to keep this information confidential. We may also release your information when we believe release is appropriate to comply with the law, enforce our site policies, or protect ours or others' rights, property, or safety. However, non-personally identifiable visitor information may be provided to other parties for marketing, advertising, or other uses.

How to opt-out, remove or modify information provided to us

To modify your e-mail subscriptions, please let us know by modifying your preferences in the "My Account" section. Please note that due to email production schedules you may receive any emails already in production. To delete all of your online account information from our database, sign into the "My Account" section of our site and remove your shipping addresses, billing addresses & payment information. Please note that we may maintain information about an individual sales transaction in order to service that transaction and for record keeping.

Third party links

In an attempt to provide you with increased value, we may include third party links on our site. These linked sites have separate and independent privacy policies. We therefore have no responsibility or liability for the content and activities of these linked sites. Nonetheless, we seek to protect the integrity of our site and welcome any feedback about these linked sites (including if a specific link does not work).

Changes to our policy

If we decide to change our privacy policy, we will post those changes on this page. Policy changes will apply only to information collected after the date of the change. This policy was last modified on April 1, 2009.